瘤衍生的G-CSF在骨髓瘤模型中诱导免疫抑制的微环境,减少对CAR.GD2T细胞的反应
Michele Pezzella1, Concetta Quintarelli1,2, Maria C Quadraccia1,3
1Department of Onco-Haematology and Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, San Paolo N°15 Street, 00146, Rome, Italy.
Journal of hematology & oncology
|December 19, 2024
概括
针对GD2的化学抗原受体 (CAR) T细胞疗法对GD2阳性瘤显示出希望. 增强GD2表达和克服免疫抑制细胞是优化这种CAR T细胞治疗的关键.
科学领域:
- 在瘤学瘤学.
- 免疫治疗是一种免疫疗法.
- 儿科癌症研究儿童癌症研究
背景情况:
- 瘤是一种罕见的中细胞起源的儿童癌症.
- GD2是一种细胞表面点,在一些固体瘤中过度表达,包括一些瘤.
- 化学抗原受体 (CAR) T细胞疗法为GD2阳性恶性瘤提供了潜在的治疗途径.
研究的目的:
- 研究GD2特异性CAR-T细胞 (CAR.GD2) 对儿科肉瘤的治疗潜力.
- 为了评估各种类型的肉瘤亚型的GD2表达水平.
- 为了确定瘤微环境中的可能影响CAR T细胞疗效的因素.
主要方法:
- 流细胞计用于评估GD2表达在初级儿科肉瘤活检.
- 在治疗后评估了GD2表达的GD2表达,治疗后使用一种增强性肠胃同源2 (EZH2) 抑制剂,Tazemetostat.
- 软组织和骨肉瘤的体外和体外临床前模型被用于评估CAR.GD2T细胞抗瘤活性.
- 研究了骨髓衍生抑制细胞 (MDSC) 和瘤衍生G-CSF对CAR T细胞疗效的影响.
主要成果:
- 在55%的原发性瘤中检测到GD2表达,在骨髓瘤和膜骨髓瘤中检测到高水平,在尤文瘤中检测到低水平.
- CAR.GD2 T细胞在体外和体外对表达GD2的瘤表现出显著的抗瘤活性.
- 塔泽梅托斯塔特治疗前调节了GD2表达,使低GD2的肉瘤细胞对CAR.GD2 T细胞介导的杀死敏感.
- 在临床前的肉瘤模型中,CAR.GD2 T细胞表现出强大的抗瘤活性和长期持久性.
- 由瘤衍生的G-CSF驱动的免疫抑制MDSCs被发现限制了CAR.GD2T细胞的长期疗效.
结论:
- CAR.GD2 T细胞代表了GD2阳性瘤患者的有前途的治疗策略.
- 向GD2,可能与EZH2抑制相结合,可以提高治疗疗效.
- 减轻免疫抑制瘤微环境的策略,特别是针对MDSCs,对于优化CAR.GD2T细胞治疗结果至关重要.
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